Adjustable seat for a chair



Sept. 30, 1958 R. G. STALLARD ADJUSTABLE SEAT FOR A CHAIR Filed June 29, 1956 1N VENTOR Z2. 61 J'ZHLLHED ATTORNEYS United States Patent ADJUSTABLE SEAT FOR A CHAIR Ross G. Stallard, Vallejo, Calif. Application June 29, 1956, Serial No. 594,774

1 Claim. (Cl. 155-88) The present invention relates to adjustable seats for chairs, and is an improvement on my copending application Serial No. 577,785, filed April 12, 1956, entitled Adjustable Chair Seat.

The primary object of the invention is to provide an adjustable seat for a chair which can be adjusted over a wide range and lowered to the height of a normal chair seat.

Another object of the invention is to provide an adjustable chair seat having the seat held in adjusting position by a simple cam lock.

A further object of the invention is to provide an adjustable chair seat which can be adjusted without the use of tools of any kind.

A still further object of the invention is to provide an adjustable seat for chairs which is inexpensive to manufacture, simple to use, and extremely durable in service.

Other objects and advantages will become apparent in the following specification when considered in the light of the attached drawings in which:

Figure 1 is a-perspective view of the invention with the seat shown in adjusted position in dotted lines.

Figure 2 is an enlarged fragmentary side elevation of the rear portion of the invention.

Figure 3 is a perspective fragmentary view of a modified form of the invention.

Referring now to the drawings in detail wherein like reference characters indicate like parts throughout the several figures, the reference numeral indicates generally a chair constructed in accordance with the invention.

The chair 10 includes a pair of front legs 11 and 12, a pair of horizontal members 13 and 14 extending rearwardly from the legs 11 and 12 at the upper ends thereof, a cross member 15 extending between the horizontal members 13 and 14 at the forward edge thereof, a pair of rear legs 16 and 17, and a rear horizontal cross member 18 extending therebetween. The rear legs 16 and 17 are secured to the rear portions of the horizontal members 13 and 14 by welding or the like. A U-shaped back member 19 extends integrally upwardly from the horizontal side members 13 and 14 and includes generally upright side members 20 and 21.

The chair 10 comprises generally a framework formed of tubular members secured together in a conventional manner by welding or the like. A generally rectangular seat 22 is positioned above the horizonal side members 13 and 14 and forwardly of the upright members 20 and 21. A generally U-shaped tubular frame 23 surrounds the seat 22 and is secured thereto. A pair of upwardly offset terminal end portions 24 and 25 extend upwardly from the rear portions of the frame 23. A tubular cam 26 is secured to each of the upstanding portions 24 and 25 by means of welding or the like, and are engaged over the upright members 20 and 21 of the back 19, as best seen in Figure l.

The tubular cam members 26 are each provided with therefrom so as to lie in the an elongated forward skirt 27 extending downwardly therefrom, as seen in Figures 1 and 2, to provide an increased area of cam contact of the tubular cam 26 with the upright members 20 and 21. A flexible friction liner 28 is positioned within the cam 26 to assist the grip of the cam 26 with relation to the upright members 20 and 21.

In the use and operation of the invention illustrated in Figures 1 and 2, the forward end of the seat frame 23 is raised slightly to disengage the skirts 27 from the uprights 20 and 21 whereupon the tubular cams 26 are slidable on the upright members 20 and 21 to any desired adjusted position.

After adjusting the height of the seat 22, as described above, the outer end or forward end of the frame 23 is permitted to drop causing the skirt 27 to engage the uprights 20 and 21 locking the seat frame 23 against further movement thereon. Obviously, the seat 22 in this form of the invention can be adjusted to any desired position from a point parallel with the horizontal members 13 and 14 to a point substantially thereabove.

In the modification of the invention illustrated in Figure 3, the tubular cam 26' is provided with'a skirt 27 identical to the tubular cam 26 and its skirt 27. A framework, one end of which is shown at 23', is secured directly to the tubular cam 26' and extends outwardly same horizontal plane thereof.

The use and operation of the invention shown in Figure 3 is identical to that as illustrated in Figure 1, and is useful in situations where the seat 22 is only adjusted to a point spaced above the horizontal members 13 and 14.

Having thus described the preferred embodiments of the invention, it should be understood that numerous other structural modifications, and adaptations may be resorted to without departing from the scope of the appended claim.

What is claimed is:

A chair comprising a plurality of legs, a horizontal framework securing said legs together, a back extending upwardly from said framework, said back including a pair of spaced parallel generally upright tubular members, a pair of cams slidably mounted on said tubular members, said cams each comprising a tubular portion having a depending arcuate skirt integrally formed as an extension of the forward half of said tubular portion, a resilient padding fixedly secured to the inner surface of said cams for augmenting the locking grip of said cams with said upright tubular members, and a seat framework comprising a U-shaped tubular frame having a pair of upwardly offset rear end portions, said end portions having the upper ends thereof outwardly offset with respect to each other, said outwardly offset ends of said rear end portions being fixedly secured to said cam, said upwardly offset rear end portions supporting said seat framework in downwardly offset relation from said cams whereby said seat framework when in lowered position will horizontally align with said horizontal framework.

References Cited in the file of this patent UNITED STATES PATENTS 732,711 Chamberland July 7, 1903 1,039,647 Carter Sept. 24, 1912 1,228,249 Sautier May 29, 1917 1,460,721 Lister July 3, 1923 2,649,972 Weil Aug. 25, 1953 2,780,276 Valente Feb. 5, 1957 FOREIGN PATENTS 595,508 Great Britain Dec. 8, 1947 

